Charger

load

+

-

+3.3V

24V

48V

+

-

+

-

48V

Inductive

Load

Inductive

Load

+5V

+5V

S

D

G

S

D

G

LMP8602, LMP8602Q, LMP8603, LMP8603Q

www.ti.com

SNOSB36D – JULY 2009 – REVISED MARCH 2013

60V Common Mode, Fixed Gain, Bidirectional Precision Current Sensing Amplifier

Check for Samples: LMP8602, LMP8602Q, LMP8603, LMP8603Q

1

FEATURES

DESCRIPTION

The LMP8602 and LMP8603 are fixed gain precision

2

•

amplifiers. The parts will amplify and filter small

differential signals in the presence of high common

= 100x (LMP8603)

mode voltages. The input common mode voltage

•

range is –22V to +60V when operating from a single

5V supply. With a 3.3V supply, the input common

•

CMRR 90 dB Min

mode voltage range is from –4V to +27V. The

•

Input Offset Voltage 1 mV Max

LMP8602 and LMP8603 are members of the Linear

•

•

parts for unidirectional and bidirectional current

sensing applications. All parameter values of the

•

Operating Ambient Temperature Range

−40°C

parts that are shown in the tables are 100% tested

to 125°C

and all bold values are also 100% tested over

•

Single Supply Bidirectional Operation

temperature.

•

All Min / Max Limits 100% Tested

The parts have a precise gain of 50x for the

•

LMP8602Q and LMP8603Q Available in

LMP8602 and 100x for the LMP8603, which are

Automotive AEC-Q100 Grade 1 Qualified

adequate in most targeted applications to drive an

Version

ADC to its full scale value. The fixed gain is achieved

in two separate stages, a preamplifier with a gain of

10x and an output stage buffer amplifier with a gain

APPLICATIONS

of 5x for the LMP8602 and 10x for the LMP8603. The

•

High Side and Low Side Driver Configuration

connection between the two stages of the signal path

Current Sensing

is brought out on two pins to enable the possibility to

•

Bidirectional Current Measurement

create an additional filter network around the output

buffer amplifier. These pins can also be used for

•

Current Loop to Voltage Conversion

alternative

configurations

with

different

gain

as

•

Automotive Fuel Injection Control

described in the applications section.

•

Transmission Control

•

Power Steering

•

Battery Management Systems

Typical Applications

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.